I was trying to burn some files to dual layer discs to free up some hard drive space. I am using toast, I dragged what I wanted into toast, it was 8.25 but it said it would span 2 discs. I tried to burn it anyway and sure enough, after a while it prompted me to insert disc 2. I then started to delete a few things to see exactly what it would hold and it doesnt appear to me to hold more than 8gb. So why are these discs rated at 8.5 if they wont hold even 8gb?